Х=-11-у
ху=28
(-11-у)у=28
-11у-у^2-28=0
у^2+11у+28=0
Д=121-4*28=9
у1=-11+9/2=-1
у2=-11-9/2=-10
у1=-1
х1=-11-(-1)=-10
у2=-10
х2=-11-(-10) =-1
Х=-11-у
ху=28
(-11-у)у=28
-11у-у^2-28=0
у^2+11у+28=0
Д=121-4*28=9
у1=-11+9/2=-1
у2=-11-9/2=-10
у1=-1
х1=-11-(-1)=-10
у2=-10
х2=-11-(-10) =-1